Scaling device



0. N. PEDERSEN..

SCALING D APPLICATION FILED EVICE. 0Ec.11,1920.

Patented Oct. 10, 1922.

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Patented @et. 10, 1922.

.tlhtl l fit l PATIENT OLA]? NIDLAND PEDERSEN, OF NEW ORLEANS, LGUIfiIANA.

SCALING DEVICE.

Application filed December 17, 1920.

boiler.

Among the ditliculties encountered in devices of this type are; adaptation of the scraping elements to the surface on which they operate; lack of sufficient fiexlbility between the driving means and the scraping elements; sudden and irregular strains put upon the driving shaft and connections due to this insuflicient flexibility; requirement of more motive power than should be neces sary; danger to the: operator from flying pieces of broken scrapers; complexity of the parts with consequent frequent disorders; limited use to a narrow field of application; short life for the useof the tool; and high cost of production. The main objects of the present invention are to overcome these and other deficiencies.

Referring to the drawings:-

Fig. 1 is a side elevation of a suitable small motor with the sealer connected, the socket plates being shown in cross section and the open. or spread position of the scrapers being shown in dotted lines; and

Fig. 2 is a top plan view of the cap plate.

The motor and its shaft may be of any usual and well known type and mounted in any desired manner.

The sealer comprises a plurality of scaling elements or heads 1 each threaded or otherwise removably secured to the end of a rod 2 the opposite end of which carries a ball 3. The head will be designed and proportioned according to the work it is to do and the sur face upon which it is to operate. The same is true of the length of the rods 2. Ball 3 of each rod is seated in a semi-spherical socket 4 in a base plate 5; the sockets being disposed eccentrically relatively to the base plate and, preferably, equi-distant from the centre and from each other, circumferentially. Cap plate 6 has sockets 7, substantially complementary to sockets 4; and c0- operating therewith. The base plate and Serial No. 431,355.

cap plate together, really constitute a head or block contaming the sockets of the ball and socket couplings. Connnumcating with each socket 7 is an opening 8 which extends through the cap plate in the direction of the thickness of the plate. Each opening is circular, as shown in Fig. 2, extends into socket T for about a third of its radius, and is parallel to the face of the cap plate. The wall 9 of each opening is tapered on an engle of about 30 degrees outwardly from the centre of the combined sockets f and 7. Jam nuts 10 may be used for locking the heads against jarring or working loose. as will be readily understood.

In assembling the parts, the balls 3 are seated in sockets and the cap plate 6 is slipped down over rods 2 so that its sockets seat on the upper or'outer halves of the balls.

With the parts thus assembled, the head or combined plates are slipped onto the end of the driving shaft 11, the outer or connecting end of which is squared or of other non-cylindrical shape, to seat in the cooperating opening 12 which extends centrally through the assembled plates' A nut 13 threaded on the proje'ctingend of- 11 clamps the assembled parts to the shaft to rotate therewith, and,

at the same time, of course, clamps the base and cap plates together so that their sockets completely and accurately enclose the balls 3. Then, the hammer heads are threaded on or otherwise secured to the ends of their respective rods and the device is ready for diameter. At the same time, because, of the ball and socket mounting of each rod, the rod is absolutely unhampered in revolving about its longitudinal axis, as will be readily understood. Shaft 11 driven by the motor,

revolves at a high rate of speed, rotating the device at a correspondingly high rate. The scaling elements are arranged eccentrically in the plates relatively to the axis of the driving shaft. Due to their ball and socket coupling or connection with the plates, these rods, therefore, are acted upon centrifugally so that they will be spread out circumferen Conse- 95 tially, as indicated in dotted lines in Fig. 1.

But, the only force maintaining them thus spread is centrifugal. Of course, during rotation, the ball ends will, necessarily, be somewhat in advance of the hammer heads so that rods 2 will be inclined both laterally and longitudinally, as will be readily understood. Each head 14 is for'medwvitlra series of concentrically disposed spirally shaped scraping edges or blades of any desired configuration. These blades, coming in contact "with the surface on which the device is used,

due to the inclinations of rods 2 and the rotation of shaft 11, will have a drawing or scraping action, while,at the same time, due

' to the'extremely'fiexible connections and the centrifugal spreading force, they will have. a hammering action as they rebound freely from the surface and are immediately returned by centrifugal force. It will be noticed that they yield freely to a large angle or degree 'ineverydirection, not merely circumferentially or radially, or in all but one or two directions. And the amount or degree of this yielding movement in every direction is ample to permit any or all heads powermay be used in the motor and all sudden strains are eliminated, reducing breaks'and repairs to the minimum.

7 I Obviously, the lengths of the rods 2, and 'the type of head will be varied a great deal to meet the many different requirements of the particular work on which the tool is to be used. Other details of construction may likewise be changed.

Many changes may be made in the construction, arrangement, and disposition of the various parts of the invention within the scopeof the appended claim without in any way departing from the field and scope of the invention, and it is meant to include all such.

Having thus described my'invention, what I claimand desire to protect by Letters Patout is:

In a rotary scraper, a shaft, a head mounted thereon to turn therewith and provided with a series of equi-distant sockets disposed eccentrically '"relativelyto the axis of rotation of said head, a series of scraping elements having balls located in-said sockets respectively andhaving' their other ends free to swing and yield in everydirection, the balls of the; respective scraping" elements being free to turn with a universal motion in said sockets and being held therein always at the same distance radially from the axis of said shaft, the scraping elements spreading under the action of centrifugal force, and in accordance therewith, and travelingin a path'defining'a cone.

In testimony whereof, I have signed my name to'this specification in thepresence of two subscribing witnesses.

OLAF NIDLAND'PEDERSEN.

WVitnesses: I s

' FRAZER L. RICE,

' THos. J. DOBBINS. 

